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eBay DIY Audiophile Series Program 3: Modifying & Upgrading Valve (Tube) Amplifiers Brand new, 4 DVD set ( approx. 4 hours), a video do-it-yourself workshop, produced and recorded in Australia. Buy a relatively “cheap” China-made valve (tube) amplifier (but average or even bad sounding!) and modify it (upgrade it) so it sounds like an audiophile amp five-ten times the price you’ve paid! Instead of buying an expensive imported “brand name” amps made in USA, UK or elswhere, save thousands of dollars by modifying and fine-tuning a budget Chinese amp and turn it into a sonic bliss! Of course, this knowledge will help you improve ANY AMPLIFIER. ONLY PAL version available. Most DVD players can play both PAL and NTSC, if you are in USA, Canada, Korea and other NTSC country, please make sure that yours can. Discs are region-free. Save a fortune by buying an inexpensive Chinese-made valve (tube) amplifier and improving its performance! For under US$500 plus transport (often even cheaper than that) and one day of your time, you could end up with an amplifier that sounds as good as audiophile amps in the $4,000 – $6,000 price range. Three case studies were used: Music Angel single ended 300B model, Yarland parallel single-ended 2A3 amp and AudioRomy EL34 push-pull amp. We measured their performance and performed extensive listening tests, identified many problems and issues (two of the 3 were not even grounded -or earthed -, making them illegal and deadly dangerous) Then we identified all the necessary upgrades and improvements and performed them in front of the camera for you, so you can see how it’s done and why! Learn: 8 important steps to take before you decide to purchase a particular tube amp How to measure maximum power, maximum undistorted power, damping factor and frequency range of any amplifier How to convert an amplifier with self-biasing output stage so it uses fixed bias -this will give you 30%-40% increase in power! How to fix certain problems with output transformers (one amp had badly-made audio trafoss, the top frequency limit was only 9.6 kHz, instead of 20-30 kHz!) . How to cheaply construct a step-down transformer without spending $100-$150 for a large power transformer (two amps were designed for 220Vac, and would not work properly on Australia’s nominal 240 Vac, let alone on the actual measured voltage of 248 Vac!) This is a great trick of ours, just this saving will almost pay for your investment in this program! How to convert an ultra-linear or pentode push-pull amplifier into a triode mode (for an incredible improvement in sound quality). How to find and remove negative feedback for a vastly more natural and effortless sound! How to replace resistors in power supply filtering with chokes (for a 1,500% or 15 times reduced ripple and hum and much better dynamics). How to double the power supply filtering (a separate one for each channel) for better channel separation and a quantum leap in sonic performance. How to ground (earth) an amplifier (two of our samples were not earthed at all – not just illegal, but downright dangerous)! How to determine if the output transformers on your amp are adequate or undersized How to replace a tube rectifier with solid state rectifier, for a huge increase in reserve energy of the amplifier’s power supply and better dynamics (with SS rectifiers you can use much larger capacitance, hence the increased stored energy). Plus, tube rectifiers don’t last long. Since these tubes work full-capacity, all the time, they are the first ones to need replacing. A killer fully balanced circuit (“triple differential” topology) that makes a push-pull amplifier with a midrange as good as a single ended amp, but with better & tighter bass, superior top end, more power and more dynamics! Yes, it is possible to get the best of both worlds! + much, much more …. We give you lots of circuit schematics (original and modified options) and sound-improving ideas, we show you tips and tricks for saving your money and your sanity. Just upgrading the tubes (valves) and some capacitors will NOT get you anywhere, you will just be wasting your money for perhaps a 5% improvement in the sound. If the amplifier design or built is not optimised, tube rolling is inneffective. All three of these amps had more serious issues which had to be rectified if any significant sonic improvement was to be achieved. Apart from all the action filmed on top-resolution (highest quality) DVDs, this program comes with a bonus book (A4-sized manual in full color), photo album with 62 full colour photos! Schematics, close-up shots of important details, the photos of the flip-charts used in the program. This DVD workshop is a “must have” for all serious audiophiles and DIY constructors and tweakers who want to improve their existing amplifier (you can apply these principles to improving any amplifier!)
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